Raise one invoice for a block of sessions agreed with a client, or for the six an EAP has authorised. Every session booked afterwards is already billed on it, at the block rate, until the block runs out.
Selling a block of sessions upfront normally means an invoice the platform knows nothing about, and then remembering not to bill those sessions again as the client uses them. Session blocks close that gap. You add the block to an ordinary invoice and send it as you always have. What changes is that it is live the moment you save it, so coverage never waits for the money, and each matching session that follows is priced and billed against it without a second invoice. Sessions already in your diary are deliberately left alone, so nothing is swept up by accident: you bill those one at a time. An EAP that has authorised a set number of sessions works the same way.
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